Re: irq handling in DDE Linux26

From:

Samuel Thibault

Subject:

Re: irq handling in DDE Linux26

Date:

Fri, 7 May 2010 10:31:51 +0200

User-agent:

Mutt/1.5.12-2006-07-14

Hello,
Da Zheng, le Fri 07 May 2010 00:53:20 +0800, a écrit :
> In ne2k-pci, an example in DDE Linux26, when a packet is transmitted by the
> driver, disable_irq_nosync_lockdep_irqsave() is called to disable irq. Then it
> triggers a send and calls enable_irq_lockdep_irqrestore().
> Should the interrupt handler delays interrupts instead of ignoring
> them silently when the interrupt line is disabled?
See __enable_irq in the linux source code:
check_irq_resend(desc, irq);
which re-sends the irq if it has been set to pending while it was
disabled.
Samuel